Why Does My EV Charger Keep Tripping? RCD & Fault Guide
EV Charger Keeps Tripping? RCD Fault Guide
A charger that trips once might be nothing. A charger that trips repeatedly is telling you something, and repeatedly resetting a protective device without finding out why is not a safe long-term fix.
Quick answer
Repeated tripping usually points to one of: a genuine earth fault in the charging cable or vehicle, the wrong RCD type fitted for the charger (see Type B RCDs), a worn or faulty protective device, or a shared circuit being overloaded. Call an electrician if resets don’t hold, or if the trip coincides with wet weather or a specific vehicle.
A quick triage
| Pattern | Likely cause |
|---|---|
| Trips every time, with any vehicle | Fault in the charger, its cable, or the fixed wiring, rather than the car |
| Trips only with one specific vehicle | Points to that vehicle’s onboard charger or a genuine leakage fault in the car, not your installation |
| Trips mainly in wet or damp weather | Water ingress into a connector, cable, or outdoor enclosure, a common and often overlooked cause |
| Trips shortly after installation and never resets cleanly | Wiring or configuration fault; get the original installer back before assuming a product fault |
| Started tripping after months or years of normal use, with no other change | A worn RCD/RCBO, or a developing cable fault; have the device tested rather than just replaced on guesswork |
| Trips together with other circuits on the same board | The RCD may be shared across more than just the charger circuit; check what else is on it |
Is it the RCD type, not a fault at all?
One specific and easily missed cause: a Type A RCD fitted where the charger produces smooth DC fault current will not detect that current reliably, but it can also, in some circuit conditions, contribute to nuisance behaviour that looks like an unrelated fault. Confirm the charger’s documentation for its DC leakage requirement rather than assuming the fitted device is correct simply because it was working before.
See What is a Type B RCD? for how to check this properly.
What not to do
- Don’t keep resetting the device repeatedly without investigating, it’s there to protect you
- Don’t bypass, disable, or replace the RCD/RCBO with a higher-rated device to “stop the tripping”
- Don’t assume it’s always the charger’s fault; the vehicle, the cable, and the fixed wiring can each be the cause
- Don’t ignore a pattern tied to weather, it usually means water ingress somewhere in the circuit
When to call an electrician
Call a qualified electrician if the device won’t reset and hold at all, if the trips are frequent or unpredictable, if you notice any physical damage to the cable or charger, or if you’ve worked through the checks above and the cause still isn’t clear. A charger that trips occasionally under genuinely unusual conditions and otherwise works reliably is a different situation to one that trips every time you try to charge.
Frequently asked questions
Is it safe to keep using the charger if it trips occasionally?
An RCD or RCBO tripping is the protective device doing its job, so it should never simply be reset and ignored as routine. Occasional trips under clearly unusual conditions (a one-off, in heavy rain, say) are different from frequent or unexplained trips, which warrant investigation before continued use.
Could the fault be in the car rather than my installation?
Yes. If the charger trips reliably with one specific vehicle but not with others, the leakage fault is most likely in that vehicle’s onboard charging electronics rather than your installation.
Does a charger that worked fine for years suddenly develop a fault?
Yes, this is common. Cables and connectors degrade with use and weather exposure, and protective devices themselves can wear over years of operation. A change after long reliable use points to something in the installation or cable rather than a design fault in the charger.
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